package org.chapter.helper;

/**
 * Created by Mr.no.
 * User:yangyun
 * Date:2017/9/27
 * Time:21:58
 */

import org.apache.commons.dbcp2.BasicDataSource;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.MapListHandler;
import org.chapter.Util.CollectionUtil;
import org.chapter.Util.PropsUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileNotFoundException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 * 数据库操作助手类
 */
public final class DatabaseHelper {
    private  static  final BasicDataSource DATA_SOURCE;
    private static  final QueryRunner QUERY_RUNNER ;
    private static final ThreadLocal<Connection> CONNECTION_HOLDER ;
    private  static  final Logger LOGGER = LoggerFactory.getLogger(DatabaseHelper.class);
    static {
        CONNECTION_HOLDER = new ThreadLocal<Connection>();
        QUERY_RUNNER = new QueryRunner();
        Properties conf = null;
        try {
            conf = PropsUtil.loadProps("config.properties");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        String driver = conf.getProperty("jdbc.driver");
        String url = conf.getProperty("jdbc.url");
        String username = conf.getProperty("jdbc.username");
        String password = conf.getProperty("jdbc.password");

        DATA_SOURCE = new BasicDataSource();
        DATA_SOURCE.setDriverClassName(driver);
        DATA_SOURCE.setUrl(url);
        DATA_SOURCE.setUsername(username);
        DATA_SOURCE.setPassword(password);
    }
    /**
     * 获取数据库连接
     */
    public static Connection getConnection() {
        Connection conn = CONNECTION_HOLDER.get();
        if (conn == null) {
            try {
                conn = DATA_SOURCE.getConnection();
            } catch (SQLException e) {
                 LOGGER.error("get connection failure",e);
                 throw new RuntimeException(e);
            } finally {
                CONNECTION_HOLDER.set(conn);
            }
        }
        return conn;
    }
//    /**
//     * 关闭数据库连接
//     */
//    public static void closeConnection(){
//        Connection conn = CONNECTION_HOLDER.get();
//        if (conn != null){
//            try {
//                conn.close();
//            } catch (SQLException e) {
//                LOGGER.error("close connection failure",e);
//                throw new RuntimeException(e);
//            }finally {
//                CONNECTION_HOLDER.remove();
//            }
//
//        }
//
//    }

    /**
     * 查询实体列表
     * @param entityClass
     * @param sql
     * @param params
     * @param <T>
     * @return
     */

    public  static <T> List<T> queryEntityList(Class<T> entityClass,String sql,Object...params){
        List<T> entityList;
       Connection conn = getConnection();
        try {
            entityList = QUERY_RUNNER.query(conn,sql,new BeanListHandler<T>(entityClass),params);
        } catch (SQLException e) {
           LOGGER.error("query entity list failure",e);
           throw new RuntimeException(e);
        }
        return  entityList;
    }
    /**
     * 查询实体
     */
     public static <T> T queryENtity(Class<T>entityClass,String sql,Object...params){
         T entity;
         Connection conn = getConnection();
         try {
             entity = QUERY_RUNNER.query(conn,sql,new BeanHandler<T>(entityClass),params);
         } catch (SQLException e) {
             LOGGER.error("query entity failure",e);
             throw new RuntimeException(e);
         }
         return entity;
     }
    /**
     * 执行查询语句
     */
    public static  List<Map<String,Object>> executeQuery(String sql,Object...params){
        List<Map<String ,Object>> result;
        try {
            Connection conn  = getConnection();
            result = QUERY_RUNNER.query(conn,sql,new MapListHandler(),params);
        } catch (SQLException e) {
           LOGGER.error("exectue query faiure",e);
           throw  new RuntimeException(e);
        }

        return result;
    }
    /**
     * 执行更新语句
     */
    public static int executeUpdate(String sql,Object...params){
        int rows = 0;
        try {
            Connection conn = getConnection();
            rows = QUERY_RUNNER.update(conn,sql,params);
        } catch (SQLException e) {
           LOGGER.error("execute update failure",e);
        }
        return rows;
    }
    /**
     * 插入实体
     */
    public static  <T> boolean insertEntity(Class<T> entityClass,Map<String,Object> fieldMap){
     if (CollectionUtil.isEmpty(fieldMap)){
         LOGGER.error("can not insert entity:filedMap is empty");
         return false;
     }
     String sql = "INSERT INTO "+getTableName(entityClass);
     StringBuilder columns = new StringBuilder("(");
     StringBuilder values = new StringBuilder("(");
     for (String fieldName : fieldMap.keySet()){
         columns.append(fieldMap).append(",");
         values.append("?,");
     }
     columns.replace(columns.lastIndexOf(","),columns.length(),")");
        values.replace(values.lastIndexOf(","),values.length(),")");
        sql += columns+"VALUSE"+values;
        Object [] params = fieldMap.values().toArray();
        return  executeUpdate(sql,params)== 1;
    }
    /**
     * 更新实体
     */
    public static  <T> boolean updateEntity(Class<T> entityCalss,long id,Map<String,Object> fieldMap){
        if (CollectionUtil.isEmpty(fieldMap)){
            LOGGER.error("can not update enity:fieldMap is empty");
            return false;
        }
        String sql = "UPDATE"+getTableName(entityCalss)+"SET";
        StringBuilder columns = new StringBuilder();
        for (String fieldName : fieldMap.keySet()){
            columns.append(fieldMap).append("=?");
        }
        sql += columns.substring(0,columns.lastIndexOf(","))+"WHERE id= ?";
        List<Object> paramList = new ArrayList<Object>();
        paramList.addAll(fieldMap.values());
        paramList.add(id);
        Object[] params =paramList.toArray();
        return executeUpdate(sql,params) == -1;
    }
    /**
     * 删除实体
     */
    public static <T> boolean deleteEntity(Class<T> entityClass,long id){
        String sql = "DELETE　FROM " +getTableName(entityClass)+"WHERE id=?";
        return executeUpdate(sql,id) ==-1;
    }
    private static String getTableName(Class<?> entityClass){
        return entityClass.getSimpleName();
    }
}
